Antex Electronics SX-5e - Manual (Page 45)

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and controlling the volume using the master volume control on the
external amplifier or mixing board the Antex Card is connected to.
One exception to setting both sliders at maximum is when playing
2 files simultaneously. In this case, it may be necessary to lower
the sliders slightly to prevent clipping from occurring when peaks
of both files occur at the same time. Note that this is a subjective
concept; how much degradation of the signal to noise ratio is ac-
ceptable depends on the particular situation.